<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>

    </ul>
    <script>
        const ul = document.querySelector('ul')//ul
        console.log(ul.children);//得到伪数组 选择的是亲儿子


        // const li2 = document.querySelector('ul li:nth-child(2)')
        // console.log(li2.previousElementSibling);//上一个兄弟
        // console.log(li2.nextElementSibling);//下一个兄弟


    </script>




</body>

</html>